Mac Audio Premium Sub 300

12″ subwoofer · 4 Ω · 200 W RMS

Fs 33 HzQts 0.34Vas 1.98 ft³

Recommended box

For a sedan, one sub, 200 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume0.71 ft³ (20 L)
Qtc0.66
Fc64 Hz
F3 (−3 dB, no cabin gain)73 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)38 Hz
Portslot 1 9/16 × 14 5/16″, 24 15/16″ long
Port velocity at 200 W41 ft/s
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33 Hz
Qts0.34
Qes0.36
Qms6
Vas1.98 ft³
Re≈ 3.4 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP92 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 7/8″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Mac Audio 12″ models